Process of producing indigo-o-nitrophenyl-lactic acid ketones.



r ED. STATES PATENT OFFICE.

JOSEPH KOETSCHET, OF LYON,

FRANCE, ASSIGNORS 'ro SOCIETE CHIMIQUE DES USINES AND ANDRE BARRIER, on ST. FONS, NEAR LYON,

nu RHONE, ANGIE-INNE- MENT GILLIARD, P. MONNET ET CARTIER, OF PARIS, FRANCE, A CORPORATION OF FRANCE.

PROCESS OF PRODUCING INDIGO-O-NITROPHENYI|-LACTIC ACID KETONES- No Drawing.

To all whom it may concern:

Be it known that we, JOSEPH KOETSOHET, of Lyon, France, and Axum; BARBIER, of St. Fons,-near Lyon, France, have invented certain new and useful Improvements in the Process of Producing Indigo-dNitrophenyl-Lactic Acid Ketones, of which the following is a' specification.

It a neutral or an alkaline oxidizing agent, for example permanganate of pot-ash, is caused to act on the solutions of the soluble salts of I ortho-nitrophenyl-nitromethane in' the presence oi acetone, ortho-nitrophenyllactic acid ketone is at once formed which remains dissolved in the dilute acetone. After the insoluble substances, for example manganese binoxid, have been filtered ofi, the ketone formed can indigo in the solution itself, by treatment in the known Way with a caustic alkali.

Example: Dissolve 9l 'grams of onitrophenyl-nitromethane in 77 0 grams ofacetone and then add 70 grams of caustic soda solu tion at 36 B. and 430 grams of water. Cool to 15 C. and add 600 grams of ice and then, in small quantities at a time, 70 grams of permanganate of potassium in very' fine powder, stirring constantly. After this addition, continue stirring until the permanganate has disappeared, and filter off the bin- Copies of this patent maybe Specification of Letters Patent. Application filed October 7, 1910. Serial N0. 585,775.

ketones.

be converted into obtained for five cents each, by addressing the Washington, D. G.,

Wash with a oxid of manganese formed.

-The substimixture of acetone and water.

Patented Jan. 23,1912. 1

tuted and homologous ortho-nitrophenyl-nitromethanes can be treated in a similar manner to obtainthe corresponding substituted The ketone formed canbe readily converted into indigo b the known treatment with a caustic alkali: the indigo formed is filtered, washed and dried. The substituted indigoes can be obtained in't-he same way by treatment of the substituted ketofies.

What we claim and desire to secure by Letters Patent is:

.1. A process for the manufacture of indigo o-nitrophenyl lactic acid ketones, comprising oxidation of an ortho-ni rophenylnitromethane, in presence of acetone.

2. A process for the manufacture ofindigo o-nitrophenyl lactic acid ketones, comprising oxidation of an ort-ho-nitrop-henylnitromethane, in alkaline solution, in presence of acetone. y I

. In witness whereof, We have hereunto signed our names in the presence. of two subscribing witnesses.

JOSEPH KOETSCHET.

ANDRE BARBIER; \Vitnesses W. E. WATTS,

GUILLQT CLAUDE Commissioner of Patents,- 

